[OHIF-177] - JSDocs (#1818)

* OHIF-177 JSDocs.

* Add proxy for activeDataSource to extensionManager.

platform/core/src/DICOMSR/dataExchange.js

@@ -82,6 +82,11 @@ const storeMeasurementsOld = async (measurementData, filter, server) => {
   }
 };
 
+/**
+ *
+ * @param {object[]} measurementData An array of measurements from the measurements service
+ * that you wish to serialize.
+ */
 const downloadReport = measurementData => {
   const srDataset = generateReport(measurementData);
   const reportBlob = dcmjs.data.datasetToBlob(srDataset);
@@ -91,6 +96,11 @@ const downloadReport = measurementData => {
   window.location.assign(objectUrl);
 };
 
+/**
+ *
+ * @param {object[]} measurementData An array of measurements from the measurements service
+ * that you wish to serialize.
+ */
 const generateReport = measurementData => {
   const ids = measurementData.map(md => md.id);
   const filteredToolState = _getFilteredCornerstoneToolState(ids);
@@ -103,6 +113,12 @@ const generateReport = measurementData => {
   return report.dataset;
 };
 
+/**
+ *
+ * @param {object[]} measurementData An array of measurements from the measurements service
+ * that you wish to serialize.
+ * @param {object} dataSource The dataSource that you wish to use to persist the data.
+ */
 const storeMeasurements = async (measurementData, dataSource) => {
   // TODO -> Eventually use the measurements directly and not the dcmjs adapter,
   // But it is good enough for now whilst we only have cornerstone as a datasource.

platform/core/src/extensions/ExtensionManager.js

@@ -137,6 +137,7 @@ export default class ExtensionManager {
 
   getDataSources = dataSourceName => {
     if (dataSourceName === undefined) {
+      // Default to the activeDataSource
       dataSourceName = this.activeDataSource;
     }
 
@@ -144,6 +145,10 @@ export default class ExtensionManager {
     return this.dataSourceMap[dataSourceName];
   };
 
+  getActiveDataSource = () => {
+    return this.activeDataSource;
+  };
+
   /**
    * @private
    * @param {string} moduleType